Wgu C959 - Discrete Math Exam Questions And Answers

The only real numbers that satisfy |x| = x2 are what? {Ans: -1, 0, 1}Write the set-builder notation for "the set of all x's, such that x is greater than 0" {Ans: { x | x > 0}}What is the power set of {1,2}? {Ans: ∅, {1}, {2}, {1, 2} }}Give the truth table for ¬(p ↔ q) {Ans: F T T F}A = { a, b, c, d } X = { 1, 2, 3, 4 } f = { (a, 3), (b, 1), (c, 4), (d, 1) } What is the target of the function f? {Ans: {1, 2, 3, 4}}A = { 2, 3, 5, 7, 14 } 2 ∈ P(A) True of False {Ans: False (The elements of P(A) are all subsets of A. 2 is an element of A, which is written as 2 ∈ A)}B = { x ∈ Z: x is a perfect square } ∅ ∈ B? True or False {Ans: False (All elements in B are numbers, not sets)}T/F: 0 ∈ Z+ {Ans: False}Describe in words what this formula means: (a,b) ∈ A x B {Ans: Ordered pair (a,b) are in the